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If you had tires installed and light stayed on it is possible not having spare but normally the tps sensor (tire pressure sensor) or tpm tire pressure monitor or it got damaged when new tires got installed.

If just the tires were changed and you still have the original rims on the vehicle then you may just have a bad pressure sensor in on of the rims or the system may need to be reprogammed to recognize the sensors. If the RIMS were also changed then the replacement rims may not have the pressure sensors in them in which case the light will always be on since the system is always looking for pressure sensor signals that aren't there. If the rims were replaced and don't have the sensors you can purchase and install new sensors in these rims and program them so the system will recognize them.

the light should go out in few miles. make sure that you have 36psi of pressure in all 4 tires. if you don't, add air to 36 psi and drive the car. If you do have 36psi s in all 4 tires, tahn the place that put your tires on may have broke the sensor. start with checking air pressure and making sure that you have 36psi in all 4 tires.

Maybe when you change the tires they remove or broke one or the four sensors located inside the rim or wheel, at the inside of the valve, this sensors transmit the low pressure to the computer, and if one, or all, are removed or damaged, computer will register it at as a low pressure tire

what i am wondering is if they replaced the sensors when they replaced the tires. if so it may not be programmed for the car which is why the light is on, if not (which most shops wont) they may have broke one during the installation process.

Check tire pressure in all four tires make sure they are at least 32psi.Computer should reset itself after a short ride.Unless you just had new tires put on and someone broke the sensor attached to the tire valve stem.

no its not normal. sometimes the sensors can be damaged if tires are not mounted correctly. Also they (the tire place) should have retrained the sensor locations to the TPMS unit in the vehicle. take it back and tell them why your back and have them use a TPMS scan tool( tire pressure monitor system) and check the tire sensors. and do not forget the spare as some cars have a sensor in the spare tire also.

If your vehicle has the silver-metal valve cores (as opposed to black rebber), the tire pressure light goes out once the tires are at or above the minimum inflation pressure. Note that the SPARE is also checked for proper inflation by the system. What I would do is check the spare for proper inflation. If it is low, resetting it should cure your problem. If the light does NOT go out, the dealer who put the tires on may have damaged your tire pressure sensor. To check that, you need a Toyota technician to check the output of your 5 sensors with their tire pressure sensor diagnostic tool. If one is not reading, I would take the vehicle back to the tire guy & make him buy you a new one, They are not cheap.
Hope this helps.